I'm trialling a new dietary regime on my own very complicated horse.
In all other respects she appears really healthy; her coat is blooming, eyes bright, chatty, friendly, droppings in good order, doesn't smell odd, no filling in the legs etc.
But her feet have not been right since we very ill advisedly used a particular brand of wormer in April and she then got let loose on some grass. And I firmly believe hooves don't lie, if they are not right then the horse can not be classified as 100%.
We suspect the wormer damaged the gut lining, which then had knock on effects, but who knows for sure - there is precious little research, just lots of anecdotal type information.
Anyhow I'm not one to let matters lie, so we are trying the dietary regime which is designed to help support/restore a damaged gut.
I'll let you know how it goes.